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To assess the degree of equilibration of the matter created in heavy-ionreactions at low to intermediate beam energies, a hadronic transport approach(SMASH) is employed. By using a coarse-graining method, we compute the energymomentum tensor of the system at fixed time steps and evaluate the degree ofisotropy of the diagonal terms and the relative magnitude of the off-diagonalterms. This study focuses mostly on Au+Au collisions in the energy range$\sqrt{s_{\rm NN}}$ = 2.4-7.7 GeV, but central collisions of lighter ions likeC+C, Ar+KCl and Ag+Ag are considered as well. We find that the conditionsconcerning local equilibration for a hydrodynamic description are reasonablysatisfied in a large portion of the system for a significant amount of time(several fm/c) when considering the average evolution of many events, yet theyare rarely fulfilled on an event by event basis. This is relevant for theapplication of hybrid approaches at low beam energies as they are or will bereached by the HADES experiment at GSI, the future CBM experiment at FAIR aswell as the beam energy scan program at RHIC.

The applicability of hydrodynamics in heavy ion collisions at $\sqrt{s_{\rm NN}}$= 2.4-7.7 GeV